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m in (-oo:+oo)
(6/7)*m+(4/5)*m+6/7 = 328/315 // - 328/315
(6/7)*m+(4/5)*m+6/7-(328/315) = 0
(6/7)*m+(4/5)*m+6/7-328/315 = 0
58/35*m-58/315 = 0 // + 58/315
58/35*m = 58/315 // : 58/35
m = 58/315/58/35
m = 1/9
m = 1/9
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